Tá mé go maith.
Irish son would be 'mac Éireannach' in the Irish language.
There is a Gaelic website translator that will teach you to say it in Gaelic or you can just say it in English with an Irish accent and for that I recommend Boondock Saints
In Irish it's "laethanta sona"
Maith an fear, a Nollaig!
Sláinte. It means good health.
A bheith ina fear maith
irish: comhluadar maith agus caife maith
how do you say my country in irish
Is maith an reathaí é. (He is a good runner) Is maith an reathaí í. (She is a good runner).
Brian is spelled the same in Irish and Scottish Gaelic; Brian (pronounced breeun). Unless 'Good' is a native Irish name that has been anglicized, it would be spelled 'Good'.
In Irish it's "Lá ar dóigh agat"
In Irish it's "Tá an saol go maith"